New oligothienyl-imidazo-phenanthroline chromophores for NLO applications

• Main Author: Batista, Rosa Maria Ferreira
• Publication Date: 2008
• Other Authors: Costa, Susana P. G., Lodeiro, Carlos, Belsley, M., Gomes, E. Matos, Raposo, M. Manuela M.
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/1822/7991
• topic: Phenanthroline; Imidazole; Tophene; UV-visible spectroscopy; Cromophores; Nonlinear optical (NLO) material; Hyper-rayleigh scattering (HRS) technique; Pi-conjugated systems; Thiophene; Solvatochromism; Nonlinear optics (NLO); Hyper-Rayleigh scattering technique; Chromophores; Thlophene; UV-vislble spectroscopy; Science & Technology

A new series of oligothienyl-imidazo-phenanthrolines 3 were synthesised in good to excellent yields by condensation of 5,6-phenantroline-dione 2 with formyl-thiophene derivatives 1 in the presence of ammonium acetate in glacial acetic acid. Furthermore, their solvatochromism and molecular optical nonlinearities were determined and comparatively studied. The experimental results indicate that phenanthrolines 3, due to their moderate solvatochromic properties and good optical nonlinearities, could be used as suitable probes for the determination of solvent polarity and as nonlinear optical materials.